// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "ui/views/window/dialog_delegate.h"

#include <utility>

#include "base/logging.h"
#include "build/build_config.h"
#include "ui/accessibility/ax_view_state.h"
#include "ui/base/l10n/l10n_util.h"
#include "ui/gfx/color_palette.h"
#include "ui/strings/grit/ui_strings.h"
#include "ui/views/bubble/bubble_border.h"
#include "ui/views/bubble/bubble_frame_view.h"
#include "ui/views/controls/button/label_button.h"
#include "ui/views/layout/layout_constants.h"
#include "ui/views/widget/widget.h"
#include "ui/views/widget/widget_observer.h"
#include "ui/views/window/dialog_client_view.h"

#if defined(OS_WIN)
#include "ui/base/win/shell.h"
#endif

namespace views {

////////////////////////////////////////////////////////////////////////////////
// DialogDelegate:

DialogDelegate::DialogDelegate()
    : supports_new_style_(true)
{
}

DialogDelegate::~DialogDelegate()
{
}

// static
Widget* DialogDelegate::CreateDialogWidget(WidgetDelegate* delegate,
    gfx::NativeWindow context,
    gfx::NativeView parent)
{
    return CreateDialogWidgetWithBounds(delegate, context, parent, gfx::Rect());
}

// static
Widget* DialogDelegate::CreateDialogWidgetWithBounds(WidgetDelegate* delegate,
    gfx::NativeWindow context,
    gfx::NativeView parent,
    const gfx::Rect& bounds)
{
    views::Widget* widget = new views::Widget;
    views::Widget::InitParams params;
    params.delegate = delegate;
    params.bounds = bounds;
    DialogDelegate* dialog = delegate->AsDialogDelegate();

#if defined(OS_LINUX) && !defined(OS_CHROMEOS)
    // The new style doesn't support unparented dialogs on Linux desktop.
    if (dialog)
        dialog->supports_new_style_ &= parent != NULL;
#elif defined(OS_WIN)
    // The new style doesn't support unparented dialogs on Windows Classic themes.
    if (dialog && !ui::win::IsAeroGlassEnabled())
        dialog->supports_new_style_ &= parent != NULL;
#endif

    if (!dialog || dialog->UseNewStyleForThisDialog()) {
        params.opacity = Widget::InitParams::TRANSLUCENT_WINDOW;
        params.remove_standard_frame = true;
#if !defined(OS_MACOSX)
        // Except on Mac, the bubble frame includes its own shadow; remove any
        // native shadowing. On Mac, the window server provides the shadow.
        params.shadow_type = views::Widget::InitParams::SHADOW_TYPE_NONE;
#endif
    }
    params.context = context;
    params.parent = parent;
#if !defined(OS_MACOSX)
    // Web-modal (ui::MODAL_TYPE_CHILD) dialogs with parents are marked as child
    // widgets to prevent top-level window behavior (independent movement, etc).
    // On Mac, however, the parent may be a native window (not a views::Widget),
    // and so the dialog must be considered top-level to gain focus and input
    // method behaviors.
    params.child = parent && (delegate->GetModalType() == ui::MODAL_TYPE_CHILD);
#endif
    widget->Init(params);
    return widget;
}

View* DialogDelegate::CreateExtraView()
{
    return NULL;
}

bool DialogDelegate::GetExtraViewPadding(int* padding)
{
    return false;
}

View* DialogDelegate::CreateTitlebarExtraView()
{
    return NULL;
}

View* DialogDelegate::CreateFootnoteView()
{
    return NULL;
}

bool DialogDelegate::Cancel()
{
    return true;
}

bool DialogDelegate::Accept(bool window_closing)
{
    return Accept();
}

bool DialogDelegate::Accept()
{
    return true;
}

bool DialogDelegate::Close()
{
    int buttons = GetDialogButtons();
    if ((buttons & ui::DIALOG_BUTTON_CANCEL) || (buttons == ui::DIALOG_BUTTON_NONE)) {
        return Cancel();
    }
    return Accept(true);
}

base::string16 DialogDelegate::GetDialogTitle() const
{
    return GetWindowTitle();
}

int DialogDelegate::GetDialogButtons() const
{
    return ui::DIALOG_BUTTON_OK | ui::DIALOG_BUTTON_CANCEL;
}

int DialogDelegate::GetDefaultDialogButton() const
{
    if (GetDialogButtons() & ui::DIALOG_BUTTON_OK)
        return ui::DIALOG_BUTTON_OK;
    if (GetDialogButtons() & ui::DIALOG_BUTTON_CANCEL)
        return ui::DIALOG_BUTTON_CANCEL;
    return ui::DIALOG_BUTTON_NONE;
}

bool DialogDelegate::ShouldDefaultButtonBeBlue() const
{
    return false;
}

base::string16 DialogDelegate::GetDialogButtonLabel(
    ui::DialogButton button) const
{
    if (button == ui::DIALOG_BUTTON_OK)
        return l10n_util::GetStringUTF16(IDS_APP_OK);
    if (button == ui::DIALOG_BUTTON_CANCEL) {
        if (GetDialogButtons() & ui::DIALOG_BUTTON_OK)
            return l10n_util::GetStringUTF16(IDS_APP_CANCEL);
        return l10n_util::GetStringUTF16(IDS_APP_CLOSE);
    }
    NOTREACHED();
    return base::string16();
}

bool DialogDelegate::IsDialogButtonEnabled(ui::DialogButton button) const
{
    return true;
}

View* DialogDelegate::GetInitiallyFocusedView()
{
    // Focus the default button if any.
    const DialogClientView* dcv = GetDialogClientView();
    int default_button = GetDefaultDialogButton();
    if (default_button == ui::DIALOG_BUTTON_NONE)
        return NULL;

    if ((default_button & GetDialogButtons()) == 0) {
        // The default button is a button we don't have.
        NOTREACHED();
        return NULL;
    }

    if (default_button & ui::DIALOG_BUTTON_OK)
        return dcv->ok_button();
    if (default_button & ui::DIALOG_BUTTON_CANCEL)
        return dcv->cancel_button();
    return NULL;
}

DialogDelegate* DialogDelegate::AsDialogDelegate()
{
    return this;
}

ClientView* DialogDelegate::CreateClientView(Widget* widget)
{
    return new DialogClientView(widget, GetContentsView());
}

NonClientFrameView* DialogDelegate::CreateNonClientFrameView(Widget* widget)
{
    if (UseNewStyleForThisDialog())
        return CreateDialogFrameView(widget);
    return WidgetDelegate::CreateNonClientFrameView(widget);
}

// static
NonClientFrameView* DialogDelegate::CreateDialogFrameView(Widget* widget)
{
    BubbleFrameView* frame = new BubbleFrameView(gfx::Insets(kPanelVertMargin, kButtonHEdgeMarginNew,
                                                     0, kButtonHEdgeMarginNew),
        gfx::Insets());
    const BubbleBorder::Shadow kShadow = BubbleBorder::SMALL_SHADOW;
    scoped_ptr<BubbleBorder> border(
        new BubbleBorder(BubbleBorder::FLOAT, kShadow, gfx::kPlaceholderColor));
    border->set_use_theme_background_color(true);
    frame->SetBubbleBorder(std::move(border));
    DialogDelegate* delegate = widget->widget_delegate()->AsDialogDelegate();
    if (delegate) {
        frame->SetTitlebarExtraView(
            make_scoped_ptr(delegate->CreateTitlebarExtraView()));
    }
    return frame;
}

bool DialogDelegate::UseNewStyleForThisDialog() const
{
    return supports_new_style_;
}

const DialogClientView* DialogDelegate::GetDialogClientView() const
{
    return GetWidget()->client_view()->AsDialogClientView();
}

DialogClientView* DialogDelegate::GetDialogClientView()
{
    return GetWidget()->client_view()->AsDialogClientView();
}

ui::AXRole DialogDelegate::GetAccessibleWindowRole() const
{
    return ui::AX_ROLE_DIALOG;
}

////////////////////////////////////////////////////////////////////////////////
// DialogDelegateView:

DialogDelegateView::DialogDelegateView()
{
    // A WidgetDelegate should be deleted on DeleteDelegate.
    set_owned_by_client();
}

DialogDelegateView::~DialogDelegateView() { }

void DialogDelegateView::DeleteDelegate()
{
    delete this;
}

Widget* DialogDelegateView::GetWidget()
{
    return View::GetWidget();
}

const Widget* DialogDelegateView::GetWidget() const
{
    return View::GetWidget();
}

View* DialogDelegateView::GetContentsView()
{
    return this;
}

void DialogDelegateView::GetAccessibleState(ui::AXViewState* state)
{
    state->name = GetDialogTitle();
    state->role = ui::AX_ROLE_DIALOG;
}

void DialogDelegateView::ViewHierarchyChanged(
    const ViewHierarchyChangedDetails& details)
{
    if (details.is_add && details.child == this && GetWidget())
        NotifyAccessibilityEvent(ui::AX_EVENT_ALERT, true);
}

} // namespace views
